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公开(公告)号：US5943477A
公开(公告)日：1999-08-24
申请号：US85094
申请日：1998-05-26
CPC分类号： H04N1/405 , H04N1/4078
摘要： A method and apparatus to calibrate a printer which do not depend on geometric assumptions on the printed dots. The method takes account of the fundamentally probabilistic nature of the process of printing any dot on some types of printers such as laser printers. It allows estimating the probability distribution of what gets printed at each pixel depending on the local configuration of dots to be printed in such a way that only a limited number of tests need to be done, while no artificial cutoff is introduced on the size of local configurations to be taken into account. The calibration method can be applied to many problems encountered in digital printing, and permits computing printer dependent calibration of a dithering method without need for further direct measurements.
摘要翻译： 校准不依赖于打印点上的几何假设的打印机的方法和装置。 该方法考虑到在某些类型的打印机（例如激光打印机）上打印任何点的过程的根本概率性质。 它允许根据要打印的点的本地配置来估计在每个像素处打印什么的概率分布，使得仅需要进行有限数量的测试，而在本地的大小上没有引入人工截止 需要考虑的配置。 校准方法可以应用于数字打印中遇到的许多问题，并允许计算打印机相关的抖动方法的校准，而无需进一步的直接测量。
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公开(公告)号：US6055065A
公开(公告)日：2000-04-25
申请号：US132881
申请日：1998-08-12
CPC分类号： H04N1/405 , H04N1/4078
摘要： A method and apparatus for matching the print outputs of two printers having different characteristics. For the purpose of laser printing, or more generally for reproduction on any printing device with limited number of printing levels, a color or grayscale image has to be transformed into an array of printing decisions at each pixel of the output image. Sometimes this array is the only available representation of the original image. One may desire to print this array on a printer with different characteristics from the printer for which the array was originally prepared. The method and apparatus solve this problem by generating a printing decision matrix which takes into account the differences between the two printers.
摘要翻译： 一种用于匹配具有不同特征的两台打印机的打印输出的方法和装置。 为了激光打印的目的，或者更通常地，在具有有限数量的打印级别的任何打印设备上再现，颜色或灰度图像必须被变换成输出图像的每个像素处的打印决定的阵列。 有时这个数组是原始图像的唯一可用表示。 可能希望在具有与原始准备阵列的打印机不同的特征的打印机上打印该阵列。 该方法和装置通过产生考虑到两个打印机之间的差异的打印决策矩阵来解决这个问题。
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3.发明授权Methods and apparatus for generating dither mask through interpolation between preferred patterns 有权用于通过优选图案之间的插值产生抖动掩模的方法和装置公开(公告)号：US07446904B2
公开(公告)日：2008-11-04
申请号：US10856470
申请日：2004-05-28
IPC分类号： H04N1/405
CPC分类号： H04N1/4051
摘要： Techniques for generating dither masks are provided. A dither mask is generated by selecting a sequence of at least three original patterns comprising pixels of at least one of a first color and a second color. At least two patterns are interpolated to generate interpolated patterns in the sequence between the at least three original patterns. If a pattern having at least one specified characteristic exists in the sequence, the steps of interpolating between at least two patterns, and determining if a pattern having at least one specified characteristic exists in the sequence, are repeated. The interpolation is between at least one pattern from each side of the pattern having at least one specified characteristic in the sequence.
摘要翻译： 提供了产生抖动掩模的技术。 通过选择至少三个包括第一颜色和第二颜色中的至少一个的像素的原始图案的序列来生成抖动掩模。 内插至少两个图案以在至少三个原始图案之间的序列中生成插值图案。 如果序列中存在至少一个特定特征的图案，则重复在至少两个图案之间进行内插并确定序列中是否存在具有至少一个特定特征的图案的步骤。 该插值位于具有序列中至少一个指定特征的图案的每侧的至少一个图案之间。
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公开(公告)号：US6088123A
公开(公告)日：2000-07-11
申请号：US976248
申请日：1997-11-21
CPC分类号： H04N1/4051 , G06T1/0028
摘要： A method and apparatus for halftoning utilizes a truly aperiodic mask with memory requirements much smaller than the mask itself. The mask is constructed of several smaller compatible masks and a selector which selects between the smaller masks. In this way the computation of a large aperiodic mask is replaced by the computation of several much smaller masks. Using this technique, watermarks may be embedded for encrypting information in such a way that the quality of the image is not compromised.
摘要翻译： 用于半色调的方法和设备利用具有比掩码本身小得多的存储器要求的真正的非周期性掩模。 掩模由几个更小的兼容掩模和选择器构成，该选择器在较小的掩模之间进行选择。 以这种方式，通过几个更小的掩模的计算来代替大的非周期性掩模的计算。 使用这种技术，可以嵌入水印以加密信息，使得图像的质量不受损害。
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公开(公告)号：US5917951A
公开(公告)日：1999-06-29
申请号：US943881
申请日：1997-10-03
CPC分类号： H04N1/405 , H04N1/4051
摘要： A technique combines most of the advantages of both blue noise and clustering in generating a clustered aperiodic mask and using it in a dither array algorithm for halftoning. The method of halftoning of grey scale images utilizes a pixel-by-pixel comparison of the image against a clustered aperiodic mask in which the clustered aperiodic mask is comprised of a partly random and partly deterministic single valued function which is designed to produce visually pleasing dot configurations when thresholded at any level of grey.
摘要翻译： 一种技术将蓝噪声和聚类的大多数优点结合在生成聚类非周期性掩模中，并将其用于抖动阵列算法进行半色调处理。 灰度图像的半色调的方法利用图像与聚集的非周期性掩模的逐像素比较，其中聚集的非周期性掩模由部分随机和部分确定性的单值函数组成，其被设计为产生视觉上令人满意的点 在任何灰度级别进行阈值处理时的配置。
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6.发明授权Bandless halftone design for multiple beam printers employing non-orthogonal halftones 失效使用非正交半色调的多光束打印机的无带半色调设计公开(公告)号：US07545537B2
公开(公告)日：2009-06-09
申请号：US11193960
申请日：2005-07-29
CPC分类号： H04N1/4055
摘要： A multiple beam printer system having N laser beams receives print job information from a print host. A rendering application uses a threshold array to generate halftone image data from the print job. The threshold array is defined based on a spot function. The defined screen is non-orthogonal and includes Y pels in a direction that is perpendicular to a scanning direction of the laser beams where Y is an integer multiple of N. A distance between screen dots in pels is preferably equal to an integer multiple of N. The screen dot may be defined by a supercell encompassing two screen dots and having an odd number of pels in a direction that is parallel to the scanning direction. The spot function may include a snap feature that snaps a screen dot to the nearest printer grid pel. The spot function may include scaling to compensate for the distortion of the non-orthogonal screen dot.
摘要翻译： 具有N个激光束的多光束打印机系统从打印主机接收打印作业信息。 渲染应用程序使用阈值阵列从打印作业生成半色调图像数据。 基于点函数定义阈值数组。 定义的屏幕是非正交的，并且在垂直于激光束的扫描方向的Y方向上包括Y个像素，其中Y是N的整数倍。像素中的屏幕点之间的距离优选等于N的整数倍 屏幕点可以由包含两个屏幕点的超细胞定义，并且在平行于扫描方向的方向上具有奇数个像素。 斑点功能可以包括将屏幕点捕捉到最近的打印机网格像素的快照特征。 点功能可以包括缩放以补偿非正交屏幕点的失真。
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公开(公告)号：US6025930A
公开(公告)日：2000-02-15
申请号：US909535
申请日：1997-08-12
CPC分类号： H04N1/405
摘要： A technique which combines the advantages of blue noise and clustering obtains more pleasant "blueish" effects in the rendering of the grey levels for which the original multicell mask generates unwanted periodic representations. Such original multicell clustered dither array patterns which are undesirable are replaced by less periodic ones while preserving all benefits of the classical methods, and in particular, leaving the nicest patterns unchanged. An automated process redistributes the locations of the threshold values corresponding to undesirable grey levels to obtain more pleasant "blueish" effects in the rendering of the grey levels.
摘要翻译： 结合蓝噪声和聚类的优点的技术在原始多单元掩模生成不需要的周期性表示的灰度级的渲染中获得更令人愉快的“蓝色”效果。 这种不希望的原始多单元群集抖动阵列图案被较少周期性的代替，同时保留了经典方法的所有优点，特别是使最好的图案保持不变。 自动化过程重新分配对应于不期望的灰度级的阈值的位置，以在渲染灰度级中获得更令人愉快的“蓝色”效果。
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8.发明授权Detecting and compensating for color misregistration produced by a color scanner 有权检测和补偿由彩色扫描仪产生的颜色重合失调公开(公告)号：US07400430B2
公开(公告)日：2008-07-15
申请号：US10672234
申请日：2003-09-25
申请人： Joseph Stanley Czyszczewski , Hong Li , James T. Smith, II , Mikel John Stanich , Gerhard Robert Thompson , Chai Wah Wu
发明人： Joseph Stanley Czyszczewski , Hong Li , James T. Smith, II , Mikel John Stanich , Gerhard Robert Thompson , Chai Wah Wu
CPC分类号： H04N1/58
摘要： A method, computer program product and system for detecting and compensating for color misregistration. A black/white edge or a solid color edge on a target may be scanned. A black/white edge may refer to a black image, e.g., black text, on a white surrounding background having a rapid spatial transition from black to white. A solid color edge may refer to a solid color image, e.g., solid color text, on a white surrounding background having a rapid spatial transition from color to white. A curve of gray values versus spatial pixel positions for each color channel, e.g., red, green and blue color channels, may be generated. A misregistration error may then be calculated by calculating the offset between the color channel curves. The misregistration error may then be used to calibrate the scanner to compensate for the detected color misregistration.
摘要翻译： 一种用于检测和补偿颜色错配的方法，计算机程序产品和系统。 可以扫描目标上的黑色/白色边缘或纯色边缘。 黑白边缘可以指白色周围背景上的黑色图像，例如黑色文本，其具有从黑色到白色的快速空间转变。 纯色边缘可以指在白色周围背景上具有从颜色到白色的快速空间转变的纯色图像，例如纯色文本。 可以生成灰度值与每个颜色通道（例如红色，绿色和蓝色通道）的空间像素位置的曲线。 然后可以通过计算颜色通道曲线之间的偏移来计算重合失误。 然后可能会使用重合失误来校准扫描仪以补偿检测到的颜色重合失调。
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9.发明授权公开(公告)号：US07310168B2
公开(公告)日：2007-12-18
申请号：US09898254
申请日：2001-07-03
申请人： Jennifer Quirin Trelewicz , Danielle K. Dittrich , Yue Qiao , Gerhard Robert Thompson , Chai Wah Wu
发明人： Jennifer Quirin Trelewicz , Danielle K. Dittrich , Yue Qiao , Gerhard Robert Thompson , Chai Wah Wu
CPC分类号： G06K15/02 , H04N1/4055
摘要： A digital halftoning technique for controlling a spot function is disclosed. A method for generating a spot for use in halftoning according to the present invention includes defining a spot function that combines two functions selected to provide a predetermined spot shape for use in a halftone cell and scaling the spot function using a scaling function that varies according to a value of a first and second spot function ordinate. Asymmetric modulation of spot functions is used to control the touching of adjacent spots, and to change the shape of the spots with the gray region.
摘要翻译： 公开了一种用于控制光点功能的数字半色调技术。 根据本发明的用于产生用于半色调的斑点的方法包括定义点功能，其组合选择的两个功能以提供用于半色调单元的预定斑点形状，并且使用根据 第一和第二点函数纵坐标的值。 点函数的不对称调制用于控制相邻斑点的触摸，并改变斑点与灰色区域的形状。
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10.发明授权Data processing system and method for producing shifted-element halftone screens 失效用于生成移位元件半色调网的数据处理系统和方法公开(公告)号：US06687023B1
公开(公告)日：2004-02-03
申请号：US09550780
申请日：2000-04-17
IPC分类号： H04N1403
CPC分类号： H04N1/4055
摘要： A data processing system and method are described for generating a halftone screened image from an input image. A first threshold matrix is generated which, when utilized to halftone a solid gray input image, generates a first halftoned output image which is a plurality of generally solid vertical lines. The first threshold matrix includes a plurality of matrix elements arranged in a plurality of rows and a plurality of columns. A plurality of groups of the matrix elements are shifted within the first threshold matrix to create a second threshold matrix which, when utilized to halftone the solid gray input image, generates a second halftoned output image which is a checkerboard type pattern of alternating black or white blocks. In one embodiment, groups of the plurality of the rows are shifted horizontally over by at least one adjacent column to generate the second matrix.
摘要翻译： 描述了从输入图像生成半色调筛选图像的数据处理系统和方法。 产生第一阈值矩阵，当用于将实灰灰色输入图像进行半色调时，生成第一半色调输出图像，该第一半色调输出图像是多个大体上实线的垂直线。 第一阈值矩阵包括排列成多行和多列的多个矩阵元素。 多个矩阵元素组在第一阈值矩阵内移位以产生第二阈值矩阵，当第二阈值矩阵用于对实灰灰色输入图像进行半色调时，产生第二半色调输出图像，其是交替的黑色或白色的棋盘型图案 块。 在一个实施例中，多行中的组被水平移动至少一个相邻的列以产生第二矩阵。
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